k4d261638e Samsung Semiconductor, Inc., k4d261638e Datasheet - Page 14

• Manufacturer Part Number: k4d261638e
• Description: 2m X 16bit X 4 Banks Double Data Rate Synchronous Dram
• Manufacturer: Samsung Semiconductor, Inc.

AC CHARACTERISTICS (II)
AC CHARACTERISTICS (I)
Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM
K4D261638E-TC33
K4D261638E-TC2A
Row cycle time
Refresh row cycle time
Row active time
RAS to CAS delay for Read
RAS to CAS delay for Write
Row precharge time
Row active to Row active
Last data in to Row precharge
@Normal Precharge
Last data in to Row precharge
@Auto Precharge
Last data in to Read command
Col. address to Col. address
Mode register set cycle time
Auto precharge write recovery +
Precharge
Exit self refresh to read command tXSR
Power down exit time
Refresh interval time
350MHz ( 2.86ns )
K4D261638E
300MHz ( 3.3ns )
275MHz ( 3.6ns )
250MHz ( 4.0ns )
200MHz ( 5.0ns )
300MHz ( 3.3ns )
275MHz ( 3.6ns )
250MHz ( 4.0ns )
200MHz ( 5.0ns )
Frequency
Frequency
Parameter
Cas Latency
Cas Latency
4
4
4
3
3
4
4
3
3
tRC
tRFC
tRAS
tRCDRD
tRCDWR
tRP
tRRD
tWR
tWR_A
tCDLR
tCCD
tMRD
tDAL
tPDEX
tREF
Symbol
tRC
tRC
15
15
15
13
12
15
15
13
12
3tCK
Min
+tIS
200
7.8
15
17
10
4
2
5
3
3
3
3
1
2
8
-2A
100K
Max
tRFC
tRFC
17
17
15
14
17
17
17
15
14
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3tCK
Min
+tIS
200
7.8
15
17
10
4
2
5
3
3
3
3
1
2
8
tRAS
tRAS
10
10
10
10
10
-33
9
8
9
8
- 14 -
100K
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
tRCDRD tRCDWR
tRCDRD tRCDWR
3tCK
4
4
4
4
4
4
4
4
4
Min
+tIS
200
7.8
15
17
10
4
2
5
3
3
3
2
1
2
8
-36
100K
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
2
2
2
2
2
2
2
2
3tCK
Min
200
+tIS
7.8
13
15
9
4
2
4
3
3
3
2
1
2
7
-40
tRP
tRP
5
5
5
4
4
5
5
4
4
128M DDR SDRAM
100K
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
tRRD
tRRD
Rev. 1.2 (Jul. 2003)
3tCK
Min
+tIS
200
7.8
3
3
3
3
3
3
3
3
3
12
14
8
4
2
4
3
3
3
2
1
2
7
-50
(Unit : Number of Clock)
100K
Max
-
-
-
tDAL
-
-
-
-
-
-
-
-
-
-
-
-
tDAL
8
8
7
7
8
8
7
7
8
Unit Note
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
ns
us
Unit
Unit
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
1
1
1